The Silicon Environment in Silica Polymorphs, Aluminosilicate Crystals and Melts: An In Situ High Temperature XAS Study

Journal Article · Fri Feb 02 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2644544· OSTI ID:21054642

Cormier, L ^[1]; Neuville, D R; Roux, J ^[2]; Ligny, D de ^[3]; Henderson, G S ^[4]; Flank, A -M; Lagarde, P ^[5]

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1. IMPMC, Universite Pierre et Marie Curie, Universite Denis Diderot, CNRS UMR 7590, 140 rue de Lourmel, 75015 Paris (France)
2. Physique des Mineraux et des Magmas, CNRS, IPGP, 4 place Jussieu, 75005 Paris (France)
3. LPCML, UCBL, 12 rue Ampere, 69622 Villeurbanne (France)
4. Department of Geology, University of Toronto, 22 Russell Street, Toronto, M5S 3B1 Ontario (Canada)
5. Synchrotron SOLEIL, L'Orme des Merisiers, BP48, 91192 Gif-sur-Yvette cedex (France)

High temperature X-ray absorption spectroscopy at the Si K-edge has been used to obtain in situ information on SiO2 phase transitions upon heating. Important modifications are observed for the XANES spectra of the high temperature polymorphs, in relation to disordering of the SiO4 tetrahedra beyond the short-range correlations. This paper also presents the XANES spectra of anorthite (CaAl2Si2O8) from room temperature up to the melt (1900 K). This study shows the possibilities for determining the Si environment in crystals and glasses up to the liquid state using in situ XANES measurements.

• OSTI ID: 21054642
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 882; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ALUMINIUM SILICATES
ANORTHITE
CALCIUM SILICATES
CORRELATIONS
CRYSTAL STRUCTURE
CRYSTALS
GLASS
HEATING
LIQUIDS
MODIFICATIONS
PHASE TRANSFORMATIONS
SILICA
SILICON
TEMPERATURE DEPENDENCE
X-RAY SPECTRA
X-RAY SPECTROSCOPY